Oracle UCM : Oracle Universal Content Management.

Transparent Data Encryption (TDE) is NOT about access control. This is to protect the data access from OS files. If someone has access to OS datafiles, with some utilities DBFs data can be read in text format.

2)We need to create new tablespace for encrption as Existing tablespace cannot be encrypted
3)An issue with any encryption method is the negative impact on performance.
4)SELECT encrypted FROM dba_tablespaces ; --> will tell you if tablespace is encryped or not. (YES,NO)
5)cannot encrypt SYS owned objects
6) helpful query

Historically, users have wanted to encrypt data because they want to restrict data access from their database administrators. However, this problem is more of an access control problem, not an encryption problem. You can address this problem by using Oracle Database Vault to control the access to your application data from database administrators.